A Call option is an option the underlying market price of that is expected to rise. When a trader expects the market price of the underlying asset to go up, he has to choose a CALL option. When the market price of the underlying at the expiry time is higher than at the moment of purchase, the trader gets 70% profit no matter how much the market price grows, even though it is just 0.001. When the market price is the same as at the moment of purchase, the trader gets back the whole amount of his investment.